> any interrupt seems here is slow because is delayed with other or systicks .
Couldn't you assign highest "group" priority to the EXTI (or TIM14, if that would be used) interrupt?
> optimaly one edge reset TIM and second store CC1
It's again the slave-mode controller (which is not there) which would be used to reset counter in full-fledged timers.
Here, as there's only one channel, it would need to be set to both edges, and then you would need to be able to read out the captured value for one edge fast enough so that the other edge would not overwrite it.
JW
